• Title/Summary/Keyword: Positioning stages

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Design of complex IPS system to improve positioning accuracy (측위 정확도 향상을 위한 복합 IPS 시스템 설계)

  • Lee, Hyoun-sup;Kim, Jin-deog
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.21 no.10
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    • pp.1917-1922
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    • 2017
  • WPS(Wifi Positioning System) conducts positioning using wireless signals scattered in real world. This process is divided into two stages: Construction Stage that collects information on wireless signals for determining location and constructs a radio map and Positioning Stage that compares the constructed information with the collected information on wireless signals. WPS lowers the accuracy of positioning if changes occur to the collected signals during positioning. PDR have recently been studied. IPS is a system designed to find out the final destination by analyzing pedestrian's no. of gait, travel range, and direction through inertial sensors. If the positioning results of WPS appear in more than two locations, it can be thought as the problem of positioning accuracy. In some cases, problems occur. In this respect, this study analyzes the situations in which the problem as mentioned above occurs and proposes a system to solve this problem through PDR.

A Fine Motion Mechanism of Dual Servo Control for Ultraprecision Positioning (초정밀 위치 결정을 위한 이중 서보 제어용 미세 구동 메카니즘)

  • 오정석;이창우;이형석;김승우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1993.10a
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    • pp.249-254
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    • 1993
  • In order to respond to the increasing demands of ultraprecision positioning mechanism in the field of precision engineering, more accurate stages are needed whose positioning uncertainty should be in the unprecedented level of nanometers, while maintaining a long travek range. For this application, most conventional stage mechanisms are found not suitable, so the concept of dual servo, which uses two different servos, is one of the new design and control strategies being extensively investigated these days, This paper presents a fine motion mechanism as a part of research on the dual servo control. The stage is made of a single structure of elastic flexure, whose xy .theta. motions are induced in the form of elastic deformation activated by three piezoelectric actuators. Experimental results show that the translational and rotational motions of the stage can be controlled with resolutions of 5 nm and 0.1 arcsec, respectively.

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Technology Trends of Satellite Based Augmentation Systems (위성기반 보강항법시스템 기술 동향)

  • Jeongrae Kim;Yongrae Kim;Jongyoon Kim
    • Journal of Positioning, Navigation, and Timing
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    • v.13 no.1
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    • pp.25-34
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    • 2024
  • The Satellite Based Augmentation System (SBAS) improves the accuracy and reliability of user positioning by transmitting the error correction and integrity information of the global navigation satellite system signal from geostationary satellites in real time. For this reason, SBAS was designed for aircraft operations and approach procedures and is now in operational or development stages in many countries. Time has passed since the construction of SBAS and many changes have occurred in the composition of the monitoring stations and the geostationary satellites. These changes have been investigated and the current operation and development status of SBAS globally are surveyed. The development and test schedules for the transition to dual frequency multi-constellation, an important topic in SBAS, are discussed.

Permanent Magnet Biased Linear Magnetic Bearing for High-Precision Maglev Stage (초정밀 자기부상 스테이지의 위치제어를 위한 영구자석형 선형 자기베어링의 개발)

  • Lee, Sang-Ho;Chang, Jee-Uk;Kim, Oui-Serg;Han, Dong-Chul
    • Proceedings of the KSME Conference
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    • 2001.06b
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    • pp.164-169
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    • 2001
  • The active magnetic bearing has many advantages - an active positioning, no contact and lubrication free motion - and is widely used in high precision motion stages. But, the conventional magnetic bearings composed of electromagnets only are power consuming due to their bias current and have the excessive heat generation, which can make the repeatability of the positioning system worse. To overcome this drawback, we developed a novel permanent magnet (PM) biased linear magnetic bearing for a high precision magnetically levitated stage. The permanent magnets provide a bias flux and generate a bias force, and the electromagnet increases or reduces a flux of the permanent magnets and gives a levitation force. This paper presents a theoretical magnetic circuit analysis, FEM analysis and experimental data from the 1-DOF tests, and compares the theoretical power consumption of the electromagnetic bearings and the PM biased linear magnetic bearings. The PM biased linear magnetic bearing presented in this paper gives better load capacity but lower power consumption than a conventional electromagnetic bearing and will be adopted in our 6-DOF high precision linear positioning maglev stage.

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The Position Decision Experiment of Magnetic Sensor in Ball-screw Driven Linear Stage (볼나사 구동 리니어 스테이지의 마그네틱 센서 위치결정 실험)

  • Cha, Young-Youp
    • Journal of Institute of Control, Robotics and Systems
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    • v.19 no.1
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    • pp.10-14
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    • 2013
  • High precision machining technology has become one of the important parts in the development of a precision machine. Such a machine requires high precision positioning as well as high speed on a large workspace. For machining systems having a high precision positioning with a long stroke, it is necessary to examine the repeatability of reference position decision. Though ball-screw driven linear stages equipped linear scale have high precision feed drivers and a long stroke, they have some limitations for reference position decision if they have not equipped the accurate home sensor. This study is performed to experimentally examine the repeatability for home position decision of a magnetic sensor as a home switch of ball-screw driven linear stage by using capacitance probe.

The Position Decision Comparison Experiment of Hall and Photo Sensors in the Linear Stage (홀 센서와 포토 센서를 이용하는 선형 스테이지에서 위치결정 비교 실험)

  • Cha, Young-Youp
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.2
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    • pp.157-161
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    • 2015
  • For machining systems having a high precision positioning with a long stroke, it is necessary to examine the repeatability of reference position decisions. Though ball-screw driven linear stages equipped with encoders have high precision feed drivers and a long stroke, they have some limitations for reference position decisions if they have not been equipped accurate home sensors. High precision machining technology has become one of the most important aspects of the development of a precision machine. Such a machine requires high precision positioning as well as high speed on a large workspace. This study is performed to experimentally compare the repeatability for home position decisions in the case of photo sensors and hall sensors as a home switch of the ball-screw driven linear stage.

Development of Multi-axis Nano Positioning Stage for Optical Alignment (광소자 정렬용 극초정밀 다축 위치 제어장치 개발)

  • 정상화;이경형;차경래;김현욱;최석봉;김광호;박준호
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2004.10a
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    • pp.304-307
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    • 2004
  • As optical fiber communication grows, the fiber alignment become the focus of industrial attention. This greatly influence the overall production rates for the opto-electric products. We proposed multi-axis nano positioning stage for optical fiber alignment. This device has 3 DOF translation and sub nanometer resolution. This nano stage consist of 3 PZT-driven flexure stages which are stacked parallel. The displacement of it is measured with capacitance gauge and is controlled by computer-embedded main controller. The design process of flexure stage using FEM is proposed and the performance evaluation of this system is verified with experiments.

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A Position Decision Experiment in Ball-screw Driven Linear Stage using a Photomicrosensor (포토 마이크로 센서를 이용한 볼나사 구동 리니어 스테이지의 위치결정 실험)

  • Cha, Young-Youp
    • Journal of Institute of Control, Robotics and Systems
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    • v.20 no.4
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    • pp.463-467
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    • 2014
  • High precision machining technology has become one of the most important parts in the development of a precision machine. Such a machine requires high precision positioning as well as high speed on a large workspace. For machining systems having high precision positioning with a long stroke, it is necessary to examine the repeatability of the reference position decision. Though ball-screw driven linear stages equipped with linear scale have high precision feed drivers and a long stroke, they have some limitations for reference position decisions if they have not been equipped with an accurate home sensor. This study is performed to experimentally examine the repeatability for home position decision of a photo micro sensor as a home switch of a ball-screw driven linear stage by using a capacitance probe.

Optimal Design of 3D Printer based Piezo-driven Vertical Micro-positioning Stage (3D 프린터 기반 수직형 마이크로 모션 스테이지의 최적설계)

  • Kim, Jung Hyun
    • The Journal of Korea Robotics Society
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    • v.12 no.1
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    • pp.78-85
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    • 2017
  • This paper presents the development of a 3D printer based piezo-driven vertical micro-positioning stage. The stage consists of two flexure bridge structures which amplify and transfer the horizontal motion of the piezo-element into vertical motion of the end-effector. The stage is fabricated with ABS material using a precision 3D printer. This enables a one-body design eliminating the need for assembly, and significantly increases the freedom in design while shortening fabrication time. The design of the stage was optimized using response surface analysis method. Experimental results are presented which demonstrate 100nm stepping in the vertical out-of-plane direction. The results demonstrate the future possibilities of applying 3D printers and ABS material in fabricating linear driven motion stages.